id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5251	boost graph seg faults inside gdb	joao@…	Andrew Sutton	"I have a class with a boost graph member variable in it.

When I call a method from within gdb, to get the number of edges of a graph, I get a segmentation fault.

I'm attaching a standalone code that reproduces it:
1. Enter GDB
2. Set a breakpoint on line number 34
3. From within GDB execute the following:
   (a) p wrapper.dummy_.nedges()
   (b) p dummy.nedges()

3a is fine, prints out 0 as it should be. The graph is empty.

3b seg faults though...

This is the resulting call stack:

#0  0x08049b90 in std::_List_const_iterator<boost::list_edge<void*, boost::property<boost::edge_bundle_t, int, boost::no_property> > >::operator++ (this=0xbffff6fc) at /usr/include/c++/4.4/bits/stl_list.h:223

#1  0x08049427 in std::__distance<std::_List_const_iterator<boost::list_edge<void*, boost::property<boost::edge_bundle_t, int, boost::no_property> > > > (__first=..., __last=...) at /usr/include/c++/4.4/bits/stl_iterator_base_funcs.h:79

#2  0x08048ea3 in std::distance<std::_List_const_iterator<boost::list_edge<void*, boost::property<boost::edge_bundle_t, int, boost::no_property> > > > (__first=..., __last=...) at /usr/include/c++/4.4/bits/stl_iterator_base_funcs.h:114

#3  0x08048c12 in std::list<boost::list_edge<void*, boost::property<boost::edge_bundle_t, int, boost::no_property> >, std::allocator<boost::list_edge<void*, boost::property<boost::edge_bundle_t, int, boost::no_property> > > >::size (this=0xbffff7c4) at /usr/include/c++/4.4/bits/stl_list.h:805

#4  0x08048a3a in boost::num_edges<boost::detail::adj_list_gen<boost::adjacency_list<boost::listS, boost::listS, boost::undirectedS, int, int, boost::no_property, boost::listS>, boost::listS, boost::listS, boost::undirectedS, boost::property<boost::vertex_bundle_t, int, boost::no_property>, boost::property<boost::edge_bundle_t, int, boost::no_property>, boost::no_property, boost::listS>::config> (g_=...) at /usr/include/boost/graph/detail/adjacency_list.hpp:978

#5  0x08048865 in dummy_class::nedges (this=0xbffff7c4) at graph.cxx:17

#6  <function called from gdb>

#7  dummy_method () at graph.cxx:34

#8  0x080488ea in main (argc=3, argv=0xbffff914) at graph.cxx:43

This is preventing us from using the graph reliably.

Using Ubuntu 10.10 with Boost 1.42.0 and G++ 4.4.4.

Reproduceable on Ubuntu 9.10 as well."	Bugs	closed	To Be Determined	graph	Boost 1.42.0	Problem	wontfix	graph num_edges